Method of operating a blood treatment apparatus, and blood volume monitor and blood treatment apparatus for implementing the method

a technology of blood treatment apparatus and monitor, which is applied in the direction of gravity filter, feed/discharge of settling tanks, medical devices, etc., can solve the problems of not even reaching the hypertension episodes of the patient, and achieve the effect of saving tim

Active Publication Date: 2011-02-17
FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]Reflecting the obtained statement concerning the pressure or blood pressure results in a first signal which controls or regulates the blood treatment apparatus in such a manner that the ultrafiltration capacity and / or rate is lowered or reduced, for instance, so that the patient's circulation is efficiently prevented from reaching critical conditions.
[0035]By means of the method of the invention it is advantageously possible to omit a reduction of ultrafiltration in the event of dropping values relating to the blood volume (such as a drop of the RBV signal) that are inherently of relevance for a control or regulation but not accompanying or presaging a critical circulatory condition, and which must therefore be designated measurement artefacts. This saves time which the patient has to set aside for the treatment, including all the respective advantages known to the skilled person.

Problems solved by technology

An overly intense or overly rapid reduction may result in hypotension episodes on the patient's part.
A drop in the blood volume of the patient being treated to a blood volume that is critical for the latter owing to an excessive withdrawal of liquid by the ultrafiltration will thus not even be reached.

Method used

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  • Method of operating a blood treatment apparatus, and blood volume monitor and blood treatment apparatus for implementing the method
  • Method of operating a blood treatment apparatus, and blood volume monitor and blood treatment apparatus for implementing the method
  • Method of operating a blood treatment apparatus, and blood volume monitor and blood treatment apparatus for implementing the method

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Embodiment Construction

[0041]FIG. 1 shows both the relative blood volume, RBV, expressed as a percentage [%], and the blood pressure, expressed in mmHg, versus the temporal evolution of a patient's blood treatment graded in minutes. The systolic blood pressure is designated by BPsys, and the diastolic blood pressure by BPdia. In FIG. 1 the critical relative blood volume RBVkrit is moreover represented. If the RBV signal drops below this critical value, then ultrafiltration is lowered or deactivated in the present example. It is noted, however, that the represented example generally relates to the blood pressure. As was explained further above, however, another pressure may also be measured. In accordance with the above explanation, the RBV measurement is here also representative for the measurement of some other blood parameter.

[0042]As is shown by FIG. 1, the RBV signal in the example represented there suddenly drops exponentially by about 5% at the time t=150 min, to only increase again after 20 to 30 m...

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PUM

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Abstract

The present invention proposes a method of operating a blood treatment apparatus for the extracorporeal blood treatment of a patient , a blood volume monitor for monitoring an extracorporeal blood treatment of the patient by means of a blood treatment apparatus, and a blood treatment apparatus.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method of operating a blood treatment apparatus for the extracorporeal blood treatment of a patient. It furthermore relates to a blood volume monitor, as well as a blood treatment.SUMMARY[0002]In order to remove substances normally subject to excretion via the kidneys from the blood of dialysis patients, blood purification or blood treatment methods such as hemodialysis, hemofiltration, or hemodiafiltration are being employed.[0003]The withdrawal of excess body water, which is generally also necessary in such cases, takes place with the aid of ultrafiltration, generally resulting in a reduction of the patient's blood volume. An overly intense or overly rapid reduction may result in hypotension episodes on the patient's part. The patients' tolerance with regard to a volume reduction is highly variable depending on the individual; in cases of critical patient groups such as, e.g., diabetics, atherosclerosis patients, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D61/32G05D7/00G05D16/00
CPCA61M1/16A61M1/3609A61M1/3639
Inventor MOISSL, ULRICHCHAMNEY, PAULWABEL, PETER
Owner FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
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